Chair base



FIG. 1 is a perspective view of a chair base showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an enlarged fragmented cross-sectional view of the leg end taken along line 8—8 of FIG. 6. 

The ornamental design for a chair base, as shown and described. 